diff --git a/source/jabber/index.html.slim b/source/jabber/index.html.slim
index eab2781..1ee8f08 100644
--- a/source/jabber/index.html.slim
+++ b/source/jabber/index.html.slim
@@ -39,7 +39,7 @@ table.pure-table.pure-table-bordered summary="Connection information"
 p
   ' We use certificate from
   a href="http://www.cacert.org/" cacert
-  '  on our server. Install theire root certificate from
+  '  on our server. Install their root certificate from
   a href="http://www.cacert.org/index.php?id=3" here
   '  to avoid certificate validation errors